diff --git a/docs/next/CHANGELOG.md b/docs/next/CHANGELOG.md
index 03bae097..20f39658 100644
--- a/docs/next/CHANGELOG.md
+++ b/docs/next/CHANGELOG.md
@@ -2,6 +2,9 @@
 
 ## Unreleased
 
+### Fixed
+- The OpenCode integration no longer treats `session.created` or `session.updated` plugin events as idle signals, so active sessions stay marked working until OpenCode reports `session.status` or `session.idle`. (#351)
+
 ## [0.6.5] - 2026-05-29
 
 ### Added
diff --git a/src/integration/assets/opencode/herdr-agent-state.js b/src/integration/assets/opencode/herdr-agent-state.js
index 17eb5ad9..ed0958fd 100644
--- a/src/integration/assets/opencode/herdr-agent-state.js
+++ b/src/integration/assets/opencode/herdr-agent-state.js
@@ -2,7 +2,7 @@
 // managed by herdr; reinstalling or updating the integration overwrites this file.
 // add custom hooks/plugins beside this file instead of editing it.
 // HERDR_INTEGRATION_ID=opencode
-// HERDR_INTEGRATION_VERSION=2
+// HERDR_INTEGRATION_VERSION=3
 
 import net from "node:net";
 
@@ -111,9 +111,8 @@ export const HerdrAgentStatePlugin = async () => {
           break;
         case "session.created":
         case "session.updated":
-          if (sessionID) {
-            await reportState("idle", sessionID);
-          }
+          // session.created and session.updated are metadata events; lifecycle
+          // state comes from session.status and the deprecated session.idle.
           break;
         case "session.status": {
           const status =
diff --git a/src/integration/mod.rs b/src/integration/mod.rs
index c309e2d3..ccd3e045 100644
--- a/src/integration/mod.rs
+++ b/src/integration/mod.rs
@@ -27,7 +27,7 @@ const CODEX_INTEGRATION_VERSION: u32 = 4;
 const CODEX_HOME_ENV_VAR: &str = "CODEX_HOME";
 const OPENCODE_PLUGIN_INSTALL_NAME: &str = "herdr-agent-state.js";
 const OPENCODE_PLUGIN_ASSET: &str = include_str!("assets/opencode/herdr-agent-state.js");
-const OPENCODE_INTEGRATION_VERSION: u32 = 2;
+const OPENCODE_INTEGRATION_VERSION: u32 = 3;
 const HERMES_PLUGIN_INSTALL_NAME: &str = "herdr-agent-state";
 const HERMES_PLUGIN_MANIFEST_INSTALL_NAME: &str = "plugin.yaml";
 const HERMES_PLUGIN_INIT_INSTALL_NAME: &str = "__init__.py";
@@ -2859,6 +2859,7 @@ mod tests {
         assert!(OPENCODE_PLUGIN_ASSET.contains("properties?.sessionID"));
         assert!(OPENCODE_PLUGIN_ASSET.contains("dispose: async"));
         assert!(OPENCODE_PLUGIN_ASSET.contains("agent_session_id: sessionID"));
+        assert!(!OPENCODE_PLUGIN_ASSET.contains("await reportState(\"idle\", sessionID);\n          }\n          break;\n        case \"session.status\""));
         assert!(HERMES_PLUGIN_INIT_ASSET.contains("session_id = _session_id(kwargs)"));
         assert!(HERMES_PLUGIN_INIT_ASSET.contains("agent_session_id"));
         // Qoder hook reads the event from the stdin JSON payload (per